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    <title>Math</title>
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<script>
    //1. ceil(x) 向上取整 ****************
    //2. floor(x) 向下取整 ****************
    //3. round(x) 把数四舍五入为最接近的整数
    //4. random() 随机数,返回的是0.0-1.0之间范围(含头不含尾)
    //需求：生成[10,100]的整数
    //5. pow(x,y) 幂运算 x的y次方
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